The contact owns a 2017 Nissan Titan. The contact stated that after reversing in a parking spot, the vehicle caught fire without warning. There were no reported injuries. The contact attempted to disconnect the battery, however detected fire emerging from the passenger side air conditioner vent. The vehicle was towed to a local dealer where it was diagnosed there was a wire harness failure. The vehicle was not repaired. The investigator's report stated there was excessive water damage at the point of the fire. The manufacturer was notified however, the claim was denied. The failure mileage was approximately 44, 600.